<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>bind</title>
</head>

<body>
    <div>打开浏览器控制台查看结果</div>
    <script>
        const bind =
            (handler, context, ...bindArgs) =>
                (...args) =>
                    handler.apply(context, [...bindArgs, ...args]);
        function greet(greeting, punctuation) {
            return greeting + ' ' + this.user + punctuation;
        }
        const freddy = { user: 'fred' };
        const freddyBound = bind(greet, freddy);
        console.log(freddyBound('hi', '!'));
    </script>
</body>

</html>